LabRuna: A little language you can read

Runa is a small, readable programming language with a complete interpreter pipeline: a lexer, a Pratt parser, and a tree-walking interpreter supporting closures and recursion. It now handles arrays, while loops, assignment, and higher-order builtins like map, filter, and reduce, and the run(src) function returns output, result, and error so the whole pipeline is testable - 18 tests run real programs. It is a from-scratch, zero-dependency build you can download and run locally.